Blender Git Loki

Cycles: experimental correlated multi-jittered sampling pattern that can be used
instead of sobol. So far one doesn't seem to be consistently better or worse than
the other for the same number of samples but more testing is needed.

The random number generator itself is slower than sobol for most number of samples,
except 16, 64, 256, .. because they can be computed faster. This can probably be
optimized, but we can do that when/if this actually turns out to be useful.

Paper this implementation is based on:
http://graphics.pixar.com/library/MultiJitteredSampling/

Also includes some refactoring of RNG code, fixing a Sobol correlation issue with
the first BSDF and < 16 samples, skipping some unneeded RNG calls and using a
simpler unit square to unit disk function.

Code cleanup: avoid some warnings due to implicit uint/int/float/double conversion.

Usablity:

Textbuttons: double click now selects entire words (like on file path segements)
Triple click was requested too, but that's not a WM event type yet.

Cycles: mist pass added, with start/depth/falloff control. If the pass is
enabled in a render layer a Mist Pass panel will be shown in the world
properties.

add default preset for font settings.

add support for storing text styles in themes.
also reset text styles when resetting to the default theme.

change to r57261, replace BLI_cleanup_dir with BLI_split_dir_part

Reverted unwanted checkin of work in progres from my previews commit

Renamed Panel to 'Vertex Weights' (describe its functionality more precise)

text rendering: shadow offset was causing text to clip, now check for clipping without the shadow since not-drawing characters because of subtle effect is rather annoying.

fix for copy/paste error in scaling text by DPI, vertical shadow offset wasn't working for panel text.

code cleanup: use more standard names for userpref ui functions was using `context` for style vars.

fix [#35650] parented camera behavior

fly mode with parenting was broken for both locked/unlocked parent mode.

Fix #35651, #35645.
Hidden faces do not get UvElements generated so essentially this caused
a null point reference on edge lookup.

Fix #35644: lamp specials menu still showed blender internal energy and falloff
distance when cycles was selected as renderer.

style cleanup

fix [#35646] Image offset value in empty image display mode should be unitless

Merge branch 'FIX_Previous_Folder' into trunk

fix issue with new bridge tool interpolation [#35636]

Fix for frame node property display: Extended frame node properties such as the "shrink" option were not shown in the node editor sidebar. This was because the RNA type for the node was not using
NodeInternal as a base, which is a wrapper to expose the C callbacks as methods in bpy. Now these basic node types are also based on NodeInternal to ensure the full interface is available to py scripts.

In the process removed the unused NodeGroup register function, this doesn't work nicely anyway because it requires multiple inheritance which RNA doesn't support (so py node groups should be done
entirely in python in the future).